DEM

From OpenCity

DEM are Digital elevation model (wikipedia)

Tools

• LandSerf Load, convert, reader DEM data
• Gimp

DEM sources

• SRTM 90m Digital Elevation Data from CGIAR
• DEM/250 from USGS - Earth Resources Observation and Science (EROS)
• GTOPO30 from USGS - Earth Resources Observation and Science (EROS)